Improvement in machines for curving saw-blades



. IBLSSUSHW achne 'fw Carving 4S -aws No. 119,813. Patente-d oct. 1o,1871,

UNITED STATES PATENT CEEIGE.

BELA S. BISHOP, OF MENASHA, WISCONSIN.

, IMPROVEMENT IN MACHINES FOR CURVING SAW-BLADES.

Specification forming part of Letters Patent No. 119,813, dated October10,1871.

To all whom it may concern:

Be it known that I, BELA S. BISHOP, of Menasha, in the county ofWinnebago and State of Wisconsin, have invented a new and usefulImprovement in Machines for Curving Saw-Blades, and I do hereby declarethat the following is a true and accurate description thereof, referencebeing had to the accompanying drawing and to the letters of referencemarked thereon, and being a part of this specication, in which- Figure 1is an end elevation, and Fig. 2 is a sectional side elevation of mymachine. Fig. 3 is a cross-section of the wheel rims, showing theprocess of curving a saw-blade.`

Like letters refer to like parts in each figure.

rlhe nature of this invention relates to the construction of a machineby means of which saw-blades may be transversely curved; and it consistsin the novel and peculiar arrangement in a suitable frame of a convexedrim-wheel and a peen-wheel journaled in a slide above it, so that in thecombination of its principal-operative parts, it is constructed andarranged as more fully hereinafter described.

In the drawing, A represents a metallic frame.

lB are standards, one at each side of the frame,

connected at the top by a girt, B. O is a crosshead, having a verticalmovement in slots or guides in the standards B, and on which a downwardpressure is exerted by the set-screws D, threaded in and through thegirt. E is a shaft, transversely journaled in the lower part of theframe directly below the cross-heads, and is rotated by a crank or bypower, if preferred. F is a wheel, having a heavy rim slightly convex onits periphery. G is a peen-wheel, journaled in the cross-head directlyover the wheel F 5 the periphery of this wheel is sharp, as shown inFig.

3, and it should be made of steel or case-hardened iron. H is atable,longitudinally arranged in the frame, passing along in a plane with theupper edge of the main wheel at one side thereof, while its legs orstandards are pivoted at their lower end to transverse bars I at theends of the main frame, on the vertical plane of the main wheel.

The operation of curving a saw is as follows: The cross-head is moveddownward until the peen-wheel is a little less than the thickness of thesaw-blade distant from the main wheel, when the saw-blade is placed onthe table and its end pushed forward between the two wheels, if the mainwheel be now rotated the saw will be drawn in between the two, and as itpasses along on the table against a stationary guide thereon thepeen-wheel cuts into it and the repetition of this action, but ondifferent lines, curves the saw, shown in Fig. 3, where S represents asaw-blade as though peened with a hammer, without being (lished in alldirections, only transversely to the length of the blade and directionof the cuts.

I do not wish to confine myself to the exact arrangement of thepeen-wheel in the cross-head moving between the standards, as it may beotherwise arranged to produce the desired result.

VVhat'I claim as my invention, and desire to secure by Letters Patent,is-

The combination of the frame A, standards B, girt B', cross-head G,set-screw D, shaft E, wheel F, peen-wheel G, and table H, allconstructed and arranged substantially as and for the purpose set forth.

BELA S. BISHOP.

Witnesses:

JOHN POTTER, Jr.,

GEO. M. BEACH. (131)

